<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录页面</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/login.css">
</head>
<body>
<!-- 导航栏 -->
<div class="nav">
    网页聊天
</div>
<!-- 主窗口区 -->
<div class="login-container">
    <div class="login-dialog">
        <h3>登录</h3>
        <div class="row">
            <span>用户名</span>
            <input type="text" id="username">
        </div>
        <div class="row">
            <span>密码</span>
            <input type="password" id="password">
        </div>
        <div class="row">
            <button id="submit">登录</button>
        </div>
    </div>
</div>

<!-- 引入 jquery -->
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<!--<script src="js/jquery.min.js"></script>-->
<!-- 实现前后端交互的逻辑 -->
<script>
    let submitButton = document.querySelector('#submit');
    submitButton.onclick = function(){
        //1.获取输入框中的内容
        let username = document.querySelector('#username').value;
        let password = document.querySelector('#password').value;
        if(username=='' || password==''){
            alert("用户名或密码为空");
            return;
        }
        //2.发送ajax登录请求
        $.ajax({
            url:'/login',
            type : 'post',
            data:{
                username :username,
                password:password
            },
            success:function(result){
            //3.处理响应:
                if(result && result.userId>0){
                    alert("登录成功!");
                    //跳转到聊天页面
                    location.href = "/client.html";
                }else{
                    //登录失败:
                    alert("登录失败");
                    return;
                }
            }
        });
    }
</script>
</body>
</html>